The Golgi apparatus is a membrane-bound stack of cisternae that processes proteins and lipids synthesized in the endoplasmic reticulum (ER) and packages them for transport elsewhere in the cell. The Golgi is responsible for glycosylating proteins synthesized in the ER and also for cleaving some proteins into smaller fragments. The Golgi packages these products in vesicles for transport, either to destinations inside of the cell or outside of it.